The answer to this question, would most likely be C. mainly because, it was very hard decision for President Truman to drop the 5 ton bomb on hundreds of thousands of men, women, and children.
After spending the winter in Vinland, Leif sailed back to Greenland, and never returned to North American shores. He is generally believed to be the first
I think Jainism is one but I don't know about the other one
It was the work with the railroads have a nice day sir/maam